There are some usecases where we may want to append CFLAGS to the default CFLAGS set by Git. This could for example be to enable or disable specific compiler warnings or to change the optimization level that code is compiled with. This cannot be done without overriding the complete CFLAGS value though and thus requires the user to redeclare the complete defaults used by Git. Introduce a new variable `CFLAGS_APPEND` that gets appended to the default value of `CFLAGS`. As compiler options are last-one-wins, this fulfills both of the usecases mentioned above. It's also common practice across many other projects to have such a variable. While at it, also introduce a matching `LDFLAGS_APPEND` variable. While there isn't really any need for this variable as there are no default `LDFLAGS`, users may expect this variable to exist, as well. Note that we have to use the `override` directive here such that the flags get appended when compiling with `make CFLAGS=x CFLAGS_APPEND=y`. Signed-off-by: Patrick Steinhardt <ps@xxxxxx> --- Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Makefile b/Makefile index 2f5f16847a..b5252bed3d 100644 --- a/Makefile +++ b/Makefile @@ -1359,7 +1359,9 @@ endif # which'll override these defaults. # Older versions of GCC may require adding "-std=gnu99" at the end. CFLAGS = -g -O2 -Wall +override CFLAGS += $(CFLAGS_APPEND) LDFLAGS = +override LDFLAGS += $(LDFLAGS_APPEND) CC_LD_DYNPATH = -Wl,-rpath, BASIC_CFLAGS = -I. BASIC_LDFLAGS = -- 2.45.2.436.gcd77e87115.dirty
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