ignatenkobrain commented on this pull request.
> +
+# C++ compiler flags. This is traditionally called CXXFLAGS in makefiles.
+%build_cxxflags %{optflags}
+
+# Fortran compiler flags. Makefiles use both FFLAGS and FCFLAGS as
+# the corresponding variable names.
+%build_fflags %{optflags} %{?_fmoddir:-I%{_fmoddir}}
+
+# Link editor flags. This is usually called LDFLAGS in makefiles.
+#%build_ldflags -Wl,-z,relro %{?_lto_cflags}
+
+# Expands to shell code to seot the compiler/linker environment
+# variables CFLAGS, CXXFLAGS, FFLAGS, FCFLAGS, LDFLAGS if they have
+# not been set already.
+%set_build_flags \
+ CFLAGS="${CFLAGS:-%{build_cflags}}" ; export CFLAGS ; \
https://pubs.opengroup.org/onlinepubs/009695399/utilities/export.html
POSIX says:
```
IEEE Std 1003.1-2001/Cor 1-2002, item XCU/TC1/D6/6 is applied, adding the
following text to the end of the first paragraph of the DESCRIPTION: ``If the
name of a variable is followed by = word, then the value of that variable shall
be set to word.''. The reason for this change is that the SYNOPSIS for export
includes:
export name[=word]...
but the meaning of the optional ``= word'' is never explained in the text.
```
So I think only non-POSIX conformant shells use `foo=bar; export foo`
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