Musl support.

Author: maxim2266

Makefile

@@ -1,22 +1,21 @@
-# Disable built-in rules and variables
-MAKEFLAGS += --no-builtin-rules
-MAKEFLAGS += --no-builtin-variables
-
 # flags
 CC_WARN := -Wall -Wextra -Werror=implicit-function-declaration -Wformat -Werror=format-security
+
+ifeq ($(CC),musl-gcc)
+# musl is ISO 10646 compliant but doesn't define __STDC_ISO_10646__
+CC_EXTRA := -D__STDC_ISO_10646__=201706L
+else
+# sanitisers only work for non-musl builds
 CC_SAN := -fsanitize=address -fsanitize=leak -fsanitize=undefined -fsanitize-address-use-after-scope
+endif
 
-test:      CFLAGS := -ggdb -std=c11 -pipe $(CC_WARN) -fno-omit-frame-pointer $(CC_SAN)
-flto-test: CFLAGS := -s -O2 -pipe -std=c11 $(CC_WARN) -flto -march=native -mtune=native
-tools:     CFLAGS := -s -O2 -pipe -std=c11 $(CC_WARN)
+test:      CFLAGS := -ggdb -std=c11 -pipe $(CC_WARN) $(CC_EXTRA) -fno-omit-frame-pointer $(CC_SAN)
+flto-test: CFLAGS := -s -O2 -pipe -std=c11 $(CC_WARN) $(CC_EXTRA) -flto -march=native -mtune=native
+tools:     CFLAGS := -s -O2 -pipe -std=c11 $(CC_WARN) $(CC_EXTRA)
 
 # str library source files
 SRC := str.c str.h str_test.c
 
-# compiler
-CC := gcc
-# CC := clang
-
 # all
 .PHONY: all
 all: tools test flto-test

README.md

@@ -434,5 +434,6 @@ to see an example of its output.
 
 ## Project Status
 The library requires at least a C11 compiler. So far has been tested on Linux Mint versions
-from 19.3 to 22.0, with `gcc` versions from 9.5.0 to 13.2.0, and `clang` versions up to 18.1.3;
-it is also reported to work on ALT Linux 9.1 for Elbrus, with `lcc` version 1.25.09.
+from 19.3 to 22.0, with `gcc` versions from 9.5.0 to 13.2.0 (with either `libc` or `musl`),
+and `clang` versions up to 18.1.3; it is also reported to work on ALT Linux 9.1 for Elbrus, with
+`lcc` version 1.25.09.

tools/gen_char_class.c

@@ -40,7 +40,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // platform checks
 #ifndef __STDC_ISO_10646__
-#error "this platform does not support UNICODE (\"__STDC_ISO_10646__\" is not defined)"
+#error "this platform does not support UNICODE (__STDC_ISO_10646__ is not defined)"
 #endif
 
 #if __SIZEOF_WCHAR_T__ < 4 || __SIZEOF_WINT_T__ < 4