[Bug 240492] graphics/glew: unexpected optimizations in debug build

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240492

            Bug ID: 240492
           Summary: graphics/glew: unexpected optimizations in debug build
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: zeising at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
          Assignee: zeising at FreeBSD.org
             Flags: maintainer-feedback?(zeising at FreeBSD.org)

Created attachment 207372
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=207372&action=edit
blind fix

Mk/bsd.port.mk strips -O* flags by default when building WITH_DEBUG. If user
wants optimized debug build it should pass -g manually and define empty STRIP.

$ make WITH_DEBUG=
[...]
cc -DGLEW_NO_GLU -DGLEW_BUILD -pipe  -g -fstack-protector-strong
-fno-strict-aliasing  -O2 -Wall -W -Iinclude -I/usr/local/include -fPIC  -o
tmp/freebsd/default/shared/glew.o -c src/glew.c
cc -DGLEW_NO_GLU -DGLEW_STATIC -pipe  -g -fstack-protector-strong
-fno-strict-aliasing  -O2 -Wall -W -Iinclude -I/usr/local/include -fPIC  -o
tmp/freebsd/default/static/glew.o -c src/glew.c
cc -DGLEW_NO_GLU -pipe  -g -fstack-protector-strong -fno-strict-aliasing  -O2
-Wall -W -Iinclude -I/usr/local/include -fPIC -o
tmp/freebsd/default/shared/glewinfo.o -c src/glewinfo.c
cc -DGLEW_NO_GLU -pipe  -g -fstack-protector-strong -fno-strict-aliasing  -O2
-Wall -W -Iinclude -I/usr/local/include -fPIC -o
tmp/freebsd/default/shared/visualinfo.o -c src/visualinfo.c

Alternatively, a user may want to increase optimizations. To take effect CFLAGS
from the ports framework have to be passed after vendor CFLAGS.

$ CFLAGS=-Ofast make
[...]
cc -DGLEW_NO_GLU -DGLEW_BUILD -Ofast  -fstack-protector-strong
-fno-strict-aliasing  -O2 -Wall -W -Iinclude -I/usr/local/include -fPIC  -o
tmp/freebsd/default/shared/glew.o -c src/glew.c
cc -DGLEW_NO_GLU -DGLEW_STATIC -Ofast  -fstack-protector-strong
-fno-strict-aliasing  -O2 -Wall -W -Iinclude -I/usr/local/include -fPIC  -o
tmp/freebsd/default/static/glew.o -c src/glew.c
cc -DGLEW_NO_GLU -Ofast  -fstack-protector-strong -fno-strict-aliasing  -O2
-Wall -W -Iinclude -I/usr/local/include -fPIC -o
tmp/freebsd/default/shared/glewinfo.o -c src/glewinfo.c
cc -DGLEW_NO_GLU -Ofast  -fstack-protector-strong -fno-strict-aliasing  -O2
-Wall -W -Iinclude -I/usr/local/include -fPIC -o
tmp/freebsd/default/shared/visualinfo.o -c src/visualinfo.c

https://www.freebsd.org/doc/en/books/porters-handbook/dads-cflags.html

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