report correct warning suppression code

README.md

@@ -280,7 +280,13 @@ Overall, I would caution that if you really care about the very far tails of dis
 
 In fact, squiggle.c does have a few functions for algebraic manipulations of simple distributions at the end of squiggle.c. But these are pretty rudimentary, and I don't know whether I'll end up expanding or deleting them.
 
-### Results of running clang-tidy
+### Compiler warnings
+
+#### Harsh compilation
+
+By default, I've enabled -Warn-all, -Warn-extra. However, these produce warnings for unused variables, some of which can sometimes be inocuous. For now, I'm suppressing these using a clever UNUSED macro. If you don't like that approach, you could add -Wno-unused-parameter to your makefile and remove the macro. 
+
+#### Results of running clang-tidy
 
 clang-tidy is a utility to detect common errors in C/C++. You can run it with:
 

examples/core/01_one_sample/example.c

@@ -5,11 +5,13 @@
 // Estimate functions
 double sample_0(uint64_t* seed)
 {
+    UNUSED(seed);
     return 0;
 }
 
 double sample_1(uint64_t* seed)
 {
+    UNUSED(seed);
     return 1;
 }
 

examples/core/02_time_to_botec/example.c

@@ -12,8 +12,8 @@ int main()
     double p_b = 0.5;
     double p_c = p_a * p_b;
 
-    double sample_0(uint64_t * seed) { return 0; }
-    double sample_1(uint64_t * seed) { return 1; }
+    double sample_0(uint64_t * seed) { UNUSED(seed); return 0; }
+    double sample_1(uint64_t * seed) { UNUSED(seed); return 1; }
     double sample_few(uint64_t * seed) { return sample_to(1, 3, seed); }
     double sample_many(uint64_t * seed) { return sample_to(2, 10, seed); }
 

examples/core/03_gcc_nested_function/example.c

@@ -15,8 +15,8 @@ int main()
     int n_dists = 4;
 
     // These are nested functions. They will not compile without gcc.
-    double sample_0(uint64_t * seed) { return 0; }
-    double sample_1(uint64_t * seed) { return 1; }
+    double sample_0(uint64_t * seed) { UNUSED(seed); return 0; }
+    double sample_1(uint64_t * seed) { UNUSED(seed); return 1; }
     double sample_few(uint64_t * seed) { return sample_to(1, 3, seed); }
     double sample_many(uint64_t * seed) { return sample_to(2, 10, seed); }
 

examples/core/makefile

@@ -23,8 +23,8 @@ DEPS=$(SQUIGGLE) $(MATH)
 
 ## Flags
 DEBUG= #'-g'
+WARN=-Wall -Wextra 
 STANDARD=-std=c99
-WARNINGS=-Wall
 OPTIMIZED=-O3  #-Ofast
 
 ## Formatter
@@ -33,12 +33,12 @@ FORMATTER=clang-format -i -style=$(STYLE_BLUEPRINT)
 
 ## make all
 all:
-	$(CC) $(OPTIMIZED) $(DEBUG) 00_example_template/$(SRC)    $(DEPS) -o 00_example_template/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 01_one_sample/$(SRC)          $(DEPS) -o 01_one_sample/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 02_time_to_botec/$(SRC)       $(DEPS) -o 02_time_to_botec/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 03_gcc_nested_function/$(SRC) $(DEPS) -o 03_gcc_nested_function/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 04_gamma_beta/$(SRC)          $(DEPS) -o 04_gamma_beta/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 05_hundred_lognormals/$(SRC)  $(DEPS) -o 05_hundred_lognormals/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 00_example_template/$(SRC) $(DEPS) -o 00_example_template/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 01_one_sample/$(SRC) $(DEPS) -o 01_one_sample/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 02_time_to_botec/$(SRC) $(DEPS) -o 02_time_to_botec/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN)  03_gcc_nested_function/$(SRC) $(DEPS) -o 03_gcc_nested_function/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 04_gamma_beta/$(SRC)          $(DEPS) -o 04_gamma_beta/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 05_hundred_lognormals/$(SRC)  $(DEPS) -o 05_hundred_lognormals/$(OUTPUT)
 
 format-all:
 	$(FORMATTER) 00_example_template/$(SRC)
@@ -58,7 +58,7 @@ run-all:
 	
 ## make one DIR=01_one_sample
 one: $(DIR)/$(SRC)
-	$(CC) $(OPTIMIZED) $(DEBUG) $(DIR)/$(SRC) $(DEPS) -o $(DIR)/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) $(DIR)/$(SRC) $(DEPS) -o $(DIR)/$(OUTPUT)
 
 ## make format-one DIR=01_one_sample
 format-one: $(DIR)/$(SRC)
@@ -78,7 +78,7 @@ time-linux-one: $(DIR)/$(OUTPUT)
 profile-linux-one: 
 	echo "Requires perf, which depends on the kernel version, and might be in linux-tools package or similar"
 	echo "Must be run as sudo"
-	$(CC) $(OPTIMIZED) $(DEBUG) $(DIR)/$(SRC) $(DEPS) -o $(DIR)/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) $(DIR)/$(SRC) $(DEPS) -o $(DIR)/$(OUTPUT)
 	# $(CC) $(SRC) $(DEPS) -o $(OUTPUT)
 	sudo perf record $(DIR)/$(OUTPUT)
 	sudo perf report

examples/more/10_twitter_thread_example/example.c

@@ -5,11 +5,13 @@
 
 double sample_0(uint64_t* seed)
 {
+    UNUSED(seed); 
     return 0;
 }
 
 double sample_1(uint64_t* seed)
 {
+    UNUSED(seed); 
     return 1;
 }
 

examples/more/12_time_to_botec_parallel/example.c

@@ -9,8 +9,8 @@ int main()
     double p_b = 0.5;
     double p_c = p_a * p_b;
 
-    double sample_0(uint64_t * seed) { return 0; }
-    double sample_1(uint64_t * seed) { return 1; }
+    double sample_0(uint64_t * seed) { UNUSED(seed); return 0; }
+    double sample_1(uint64_t * seed) { UNUSED(seed); return 1; }
     double sample_few(uint64_t * seed) { return sample_to(1, 3, seed); }
     double sample_many(uint64_t * seed) { return sample_to(2, 10, seed); }
 

examples/more/makefile

@@ -25,6 +25,7 @@ DEPS=$(SQUIGGLE) $(SQUIGGLE_MORE) $(MATH) $(OPENMP)
 
 ## Flags
 DEBUG= #'-g'
+WARN=-Wall -Wextra 
 STANDARD=-std=c99
 WARNINGS=-Wall
 OPTIMIZED=-O3  #-Ofast
@@ -35,21 +36,21 @@ FORMATTER=clang-format -i -style=$(STYLE_BLUEPRINT)
 
 ## make all
 all:
-	$(CC) $(OPTIMIZED) $(DEBUG) 00_example_template/$(SRC)             $(DEPS) -o 00_example_template/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 01_sample_from_cdf/$(SRC)              $(DEPS) -o 01_sample_from_cdf/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 02_sample_from_cdf_beta/$(SRC)         $(DEPS) -o 02_sample_from_cdf_beta/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 03_ci_beta/$(SRC)                      $(DEPS) -o 03_ci_beta/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 04_nuclear_war/$(SRC)                  $(DEPS) -o 04_nuclear_war/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 05_burn_10kg_fat/$(SRC)                $(DEPS) -o 05_burn_10kg_fat/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 06_nuclear_recovery/$(SRC)             $(DEPS) -o 06_nuclear_recovery/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 07_algebra/$(SRC)                      $(DEPS) -o 07_algebra/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 08_algebra_and_conversion/$(SRC)       $(DEPS) -o 08_algebra_and_conversion/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 09_ergonomic_algebra/$(SRC)            $(DEPS) -o 09_ergonomic_algebra/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 10_twitter_thread_example/$(SRC)       $(DEPS) -o 10_twitter_thread_example/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 11_billion_lognormals_paralell/$(SRC)  $(DEPS) -o 11_billion_lognormals_paralell/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 12_time_to_botec_parallel/$(SRC)       $(DEPS) -o 12_time_to_botec_parallel/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 13_parallelize_min/$(SRC)              $(DEPS) -o 13_parallelize_min/$(OUTPUT)
-	$(CC) $(OPTIMIZED) $(DEBUG) 14_check_confidence_interval/$(SRC)    $(DEPS) -o 14_check_confidence_interval/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 00_example_template/$(SRC)             $(DEPS) -o 00_example_template/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 01_sample_from_cdf/$(SRC)              $(DEPS) -o 01_sample_from_cdf/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 02_sample_from_cdf_beta/$(SRC)         $(DEPS) -o 02_sample_from_cdf_beta/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 03_ci_beta/$(SRC)                      $(DEPS) -o 03_ci_beta/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 04_nuclear_war/$(SRC)                  $(DEPS) -o 04_nuclear_war/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 05_burn_10kg_fat/$(SRC)                $(DEPS) -o 05_burn_10kg_fat/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 06_nuclear_recovery/$(SRC)             $(DEPS) -o 06_nuclear_recovery/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 07_algebra/$(SRC)                      $(DEPS) -o 07_algebra/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 08_algebra_and_conversion/$(SRC)       $(DEPS) -o 08_algebra_and_conversion/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 09_ergonomic_algebra/$(SRC)            $(DEPS) -o 09_ergonomic_algebra/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 10_twitter_thread_example/$(SRC)       $(DEPS) -o 10_twitter_thread_example/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 11_billion_lognormals_paralell/$(SRC)  $(DEPS) -o 11_billion_lognormals_paralell/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 12_time_to_botec_parallel/$(SRC)       $(DEPS) -o 12_time_to_botec_parallel/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 13_parallelize_min/$(SRC)              $(DEPS) -o 13_parallelize_min/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) 14_check_confidence_interval/$(SRC)    $(DEPS) -o 14_check_confidence_interval/$(OUTPUT)
 
 format-all:
 	$(FORMATTER) 00_example_template/$(SRC)
@@ -87,7 +88,7 @@ run-all:
 
 ## make one DIR=06_nuclear_recovery
 one: $(DIR)/$(SRC)
-	$(CC) $(OPTIMIZED) $(DEBUG) $(DIR)/$(SRC) $(DEPS) -o $(DIR)/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) $(DIR)/$(SRC) $(DEPS) -o $(DIR)/$(OUTPUT)
 
 ## make format-one DIR=06_nuclear_recovery
 format-one: $(DIR)/$(SRC)
@@ -107,7 +108,7 @@ time-linux-one: $(DIR)/$(OUTPUT)
 profile-linux-one: 
 	echo "Requires perf, which depends on the kernel version, and might be in linux-tools package or similar"
 	echo "Must be run as sudo"
-	$(CC) $(OPTIMIZED) $(DEBUG) $(DIR)/$(SRC) $(DEPS) -o $(DIR)/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) $(WARN) $(DIR)/$(SRC) $(DEPS) -o $(DIR)/$(OUTPUT)
 	# $(CC) $(SRC) $(DEPS) -o $(OUTPUT)
 	sudo perf record $(DIR)/$(OUTPUT)
 	sudo perf report

squiggle.c

@@ -3,12 +3,14 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-// math constants
+// Defs
 #define PI 3.14159265358979323846 // M_PI in gcc gnu99
 #define NORMAL90CONFIDENCE 1.6448536269514727
+#define UNUSED(x) (void)(x)
+// ^ https://stackoverflow.com/questions/3599160/how-can-i-suppress-unused-parameter-warnings-in-c
 
-// Pseudo Random number generator
-static uint64_t xorshift32(uint32_t* seed)
+// Pseudo Random number generators
+static uint64_t xorshift64(uint64_t* seed)
 {
     // Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs"
     // See:
@@ -19,19 +21,20 @@ static uint64_t xorshift32(uint32_t* seed)
     //   <https://prng.di.unimi.it/>
     uint64_t x = *seed;
     x ^= x << 13;
-    x ^= x >> 17;
-    x ^= x << 5;
-    return *seed = x;
-}
-
-static uint64_t xorshift64(uint64_t* seed)
-{
-    // same as above, but for generating doubles instead of floats
-    uint64_t x = *seed;
-    x ^= x << 13;
     x ^= x >> 7;
     x ^= x << 17;
     return *seed = x;
+
+    /* 
+    // if one wanted to generate 32 bit ints, 
+    // from which to generate floats,
+    // one could do the following: 
+    uint32_t x = *seed;
+    x ^= x << 13;
+    x ^= x >> 17;
+    x ^= x << 5;
+    return *seed = x;
+    */
 }
 
 // Distribution & sampling functions

squiggle.h

@@ -30,4 +30,7 @@ double array_std(double* array, int length);
 // Mixture function
 double sample_mixture(double (*samplers[])(uint64_t*), double* weights, int n_dists, uint64_t* seed);
 
+// Macro to mute "unused variable" warning when -Wall -Wextra is enabled. Useful for nested functions
+#define UNUSED(x) (void)(x)
+
 #endif

squiggle_more.c

@@ -30,7 +30,7 @@ void sampler_parallel(double (*sampler)(uint64_t* seed), double* results, int n_
 
     uint64_t** seeds = malloc(n_threads * sizeof(uint64_t*));
     srand(1);
-    for (uint64_t i = 0; i < n_threads; i++) {
+    for (int i = 0; i < n_threads; i++) {
         seeds[i] = malloc(sizeof(uint64_t));
         // Constraints:
         // - xorshift can't start with 0
@@ -61,7 +61,7 @@ void sampler_parallel(double (*sampler)(uint64_t* seed), double* results, int n_
         // we can just reuse a seed, this isn't problematic because we are not doing multithreading
     }
 
-    for (uint64_t i = 0; i < n_threads; i++) {
+    for (int i = 0; i < n_threads; i++) {
         free(seeds[i]);
     }
     free(seeds);
@@ -83,6 +83,10 @@ static void swp(int i, int j, double xs[])
 
 static int partition(int low, int high, double xs[], int length)
 {
+    if(low > high || high >= length){
+        printf("Invariant violated for function partition in %s (%d)", __FILE__, __LINE__);
+        exit(1);
+    }
     // Note: the scratchpad/ folder in commit 578bfa27 has printfs sprinkled throughout
     int pivot = low + floor((high - low) / 2);
     double pivot_value = xs[pivot];
@@ -136,6 +140,7 @@ ci array_get_90_ci(double xs[], int n)
 
 ci sampler_get_ci(ci interval, double (*sampler)(uint64_t*), int n, uint64_t* seed)
 {
+    UNUSED(seed); // don't want to use it right now, but want to preserve ability to do so (e.g., remove parallelism from internals). Also nicer for consistency.
     double* xs = malloc(n * sizeof(double));
     sampler_parallel(sampler, xs, 16, n);
     ci result = array_get_ci(interval, xs, n);
@@ -216,7 +221,7 @@ typedef struct box_t {
 box process_error(const char* error_msg, int should_exit, char* file, int line)
 {
     if (should_exit) {
-        printf("@, in %s (%d)", file, line);
+        printf("%s, @, in %s (%d)", error_msg, file, line);
         exit(1);
     } else {
         char error_msg[MAX_ERROR_LENGTH];