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[build.zig] Only SUPPORT_* definitions are overridable

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Lines from `config.h` which contains "SUPPORT" are added to compilation after being parsed:
- remove whitespace
- format to preprocessor option https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html

The user supplied flags have priority over the ones read from the file.

NOTE: extension to commit 4da7f82e6f, the logic is simplified
because the SUPPORT flags only have binary values, which makes them easier to parse.
This commit is contained in:
lnc3l0t 2024-07-29 10:40:13 +02:00
parent 4da7f82e6f
commit 99307a4d55
1 changed files with 11 additions and 28 deletions
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39
src/build.zig
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@ -60,40 +60,23 @@ fn compileRaylib(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.
defer b.allocator.free(content);
var lines = std.mem.split(u8, content, "\n");
lines_loop: while (lines.next()) |line| {
if (!std.mem.startsWith(u8, line, "#define")) continue;
while (lines.next()) |line| {
if (!std.mem.containsAtLeast(u8, line, 1, "SUPPORT")) continue;
if (std.mem.startsWith(u8, line, "//")) continue;
// Remove "#define " and add "-D" prefix
var flag = try std.fmt.allocPrint(b.allocator, "-D{s}", .{line[6..]});
var flag = std.mem.trimLeft(u8, line, " \t"); // Trim whitespace
flag = flag["#define ".len - 1 ..]; // Remove #define
flag = std.mem.trimLeft(u8, flag, " \t"); // Trim whitespace
flag = flag[0..std.mem.indexOf(u8, flag, " ").?]; // Flag is only one word, so capture till space
flag = try std.fmt.allocPrint(b.allocator, "-D{s}", .{flag}); // Prepend with -D
// Skip if user is supplying the flag
var user_supplied_flags = std.mem.split(u8, config, " ");
while (user_supplied_flags.next()) |user_flag| {
// Flag could be -Dflag=1 or -Dflag
const skip_flag = user_flag[0 .. std.mem.lastIndexOf(u8, user_flag, "=") orelse user_flag.len];
if (std.mem.startsWith(u8, flag, skip_flag)) continue :lines_loop;
}
// Remove trailing comments
if (std.mem.indexOf(u8, flag, "/")) |comment_idx| {
flag = flag[0..comment_idx];
flag = try std.fmt.allocPrint(b.allocator, "{s}", .{std.mem.trim(u8, flag, " ")});
}
// Insert '=' after flag and remove spaces after equal
if (std.mem.indexOf(u8, flag, " ")) |startspaces_idx| {
flag[startspaces_idx] = '=';
// Remove spaces after equal
if (std.mem.lastIndexOf(u8, flag, " ")) |endspaces_idx| {
const left = flag[0 .. startspaces_idx + 1];
const right = flag[endspaces_idx + 1 ..];
flag = try std.fmt.allocPrint(b.allocator, "{s}{s}", .{ left, right });
}
}
// If user specifies the flag skip it
if (std.mem.containsAtLeast(u8, config, 1, flag)) continue;
// Append default value from config.h to compile flags
try raylib_flags_arr.append(b.allocator, flag);
}
// Append config flags supplied by user to compile flags
try raylib_flags_arr.append(b.allocator, config);